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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
1 Mutation will have a very subtle effect on allele frequencies. 2  Mutation rates are of the order 10 â4 to 10 â8, and the change in allele frequency will be, at most, the same order. 3  Recurrent mutation will maintain alleles in the population, even if there is strong selection against them.herefore, (p + q)2 = p2 + 2pq + q2 = 1. A solution of this equation is q = 1 â p. If union of gametes to produce the next generation is random, it can be shown that the new frequency fâ² satisfies and. That is, allele frequencies are constant between generations.